Learn what "could have been the rustle of a curtain" means, when people say it, and how to use it naturally in English.

It means the speaker thinks one possible cause was the sound of a curtain moving.
From The Missing Piece, Episode 3
The speaker is offering a possible explanation for a small sound they heard.
Use this when you are unsure and giving a likely explanation. It sounds cautious and is useful in everyday guessing.
Scenes unlock real expressions as you watch
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